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Variable area flowmeters

Electronic revision ESK3x: ER 1.0.x

DK32 - DK34 - DK37DK32 - DK34 - DK37DK32 - DK34 - DK37DK32 - DK34 - DK37 HandbookHandbookHandbookHandbook

© KROHNE 11/2018 - 4000287105 - MA DK32-34-37 R07 en

All rights reserved. It is prohibited to reproduce this documentation, or any part thereof, without

the prior written authorisation of KROHNE Messtechnik GmbH.

Subject to change without notice.

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Copyright 2018 by

KROHNE Messtechnik GmbH - Ludwig-Krohne-Str. 5 - 47058 Duisburg (Germany)

: IMPRINT :::::::::::::::::::::::::::::::::::::::

CONTENTS

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DK32 - DK34 - DK37

1 Safety instructions 5

1.1 Intended use ..................................................................................................................... 51.2 Certifications .................................................................................................................... 61.3 Pressure equipment directive.......................................................................................... 61.4 Safety instructions from the manufacturer ..................................................................... 8

1.4.1 Copyright and data protection ................................................................................................ 81.4.2 Disclaimer ............................................................................................................................... 81.4.3 Product liability and warranty ................................................................................................ 91.4.4 Information concerning the documentation........................................................................... 91.4.5 Warnings and symbols used................................................................................................. 10

1.5 Safety instructions for the operator............................................................................... 10

2 Device description 11

2.1 Scope of delivery............................................................................................................. 112.2 Device versions............................................................................................................... 122.3 Nameplate ...................................................................................................................... 142.4 Description code............................................................................................................. 152.5 Electronic revision DK32/ESK, DK34/ESK ..................................................................... 15

3 Installation 16

3.1 General notes on installation ......................................................................................... 163.2 Storage ........................................................................................................................... 163.3 Installation conditions .................................................................................................... 16

4 Electrical connections 17

4.1 Safety instructions.......................................................................................................... 174.2 Electrical connection of the limit switches.................................................................... 184.3 Settings of limit switches of DK32, DK34....................................................................... 194.4 Electrical signal output ESK3x for DK32, DK34............................................................. 20

4.4.1 Power supply......................................................................................................................... 214.4.2 Load for HART communication............................................................................................. 214.4.3 Configuration......................................................................................................................... 21

4.5 Settings of limit switches for DK37/M8M....................................................................... 224.6 Electrical signal output for DK37/M8E........................................................................... 23

4.6.1 Power supply......................................................................................................................... 244.6.2 Load for HART communication............................................................................................. 244.6.3 Configuration......................................................................................................................... 24

4.7 Grounding connections................................................................................................... 254.8 Ingress protection .......................................................................................................... 26

5 Start-up 27

5.1 Standard device .............................................................................................................. 27

CONTENTS

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6 Service 28

6.1 Maintenance ................................................................................................................... 286.2 Spare parts availability................................................................................................... 296.3 Availability of services .................................................................................................... 296.4 Returning the device to the manufacturer..................................................................... 29

6.4.1 General information.............................................................................................................. 296.4.2 Form (for copying) to accompany a returned device............................................................ 30

6.5 Disposal .......................................................................................................................... 306.6 Disassembly and recycling............................................................................................. 31

6.6.1 Description of the device components ................................................................................. 316.6.2 Indicator versions ................................................................................................................. 32

7 Technical data 34

7.1 Functional principle........................................................................................................ 347.2 Technical data................................................................................................................. 357.3 Dimensions and weight .................................................................................................. 41

7.3.1 DK32, DK34 ........................................................................................................................... 417.3.2 DK32, DK34 with transmitter housing ESK3x ...................................................................... 437.3.3 DK37/M8M............................................................................................................................. 447.3.4 DK37/M8E.............................................................................................................................. 457.3.5 Minimum distances when installing several measuring devices ........................................ 46

7.4 Measuring ranges........................................................................................................... 477.5 Differential pressure regulators.................................................................................... 49

SAFETY INSTRUCTIONS 1

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1.1 Intended use

The variable area flowmeters are suitable for measuring gases and liquids.

The devices are particularly suitable for the measurement of small quantities of:• Process or carrier gases• Nitrogen, CO2 or other industrial gases

• Sample flows for process analysers• Sealing gas or sealing liquid measurement on sealing systems• Purge fluids for measuring systems• Air or water• Chemicals and additives• Lubricating, cooling and anti-corrosive agents

CAUTION!Responsibility for the use of the measuring devices with regard to suitability, intended use and corrosion resistance of the used materials against the measured fluid lies solely with the operator.

INFORMATION!This device is a Group 1, Class A device as specified within CISPR11:2009. It is intended for use in industrial environment. There may be potential difficulties in ensuring electromagnetic compatibility in other environments, due to conducted as well as radiated disturbances.

INFORMATION!The manufacturer is not liable for any damage resulting from improper use or use for other than the intended purpose.

DANGER!For devices used in hazardous areas, additional safety notes apply; please refer to the Ex documentation.

CAUTION!Do not use any abrasive media containing solid particles.

1 SAFETY INSTRUCTIONS

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1.2 Certifications

The device fulfils all applicable statutory requirements of the EU directives:• Pressure equipment directive• For devices with electrical installations: EMC directive• Devices for use in hazardous areas: ATEX directive

The manufacturer certifies successful testing of the product by applying the CE marking.An EU declaration of conformity regarding the directives in question and the associated harmonised standards can be downloaded from our website.

1.3 Pressure equipment directive

A conformity assessment in accordance with pressure equipment directive has been carried out for the devices described. Conformity is certified by applying the CE mark. The number of the notified body is also stated.

The PED key describes the rating of the devices:

The PED key identification can be found on the nameplate of the device (for details refer to Nameplate on page 14).

CE marking

Example: PED/G1/4.3/SEP

G Gases and steam

1 Fluid group 1

4.3 Article 4.3 of the directive 2014/68/EU

SEP Sound engineering practice

INFORMATION!The stated pressures (PS) and temperatures (TS) only apply as refers to the pressure resistance of the sensor body. As regards the functionality of the entire device, further restrictions of the maximum temperature may need to be observed (e.g. ATEX approval). Devices rated below category I due to their size, do not receive the CE mark in the scope of the PED. These devices are subject to applicable sound engineering practice (SEP).


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Residual riskA risk analysis in accordance with the pressure equipment directive has been carried out for the devices . The residual risk is described as follows:

• The devices are designed according to the valid and applicable rules and standards for static operation and their pressure resistance is calculated for the declared maximum pressure and temperature (no calculation for cyclical change).

• Responsibility for the use of the measuring devices with regard to corrosion resistance of the used materials against the measured fluid lies solely with the operator.

• Avoid abrasion.• Avoid pulsation and cavitation.• Protect devices from vibration and high-frequency oscillation.• Draining (backflow) may be delayed due to the float in the measuring tube. Expect residue

around the valve and in the differential pressure regulator.• Implement appropriate measures to counteract external fire hazards


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1.4 Safety instructions from the manufacturer

1.4.1 Copyright and data protection

The contents of this document have been created with great care. Nevertheless, we provide no guarantee that the contents are correct, complete or up-to-date.

The contents and works in this document are subject to copyright. Contributions from third parties are identified as such. Reproduction, processing, dissemination and any type of use beyond what is permitted under copyright requires written authorisation from the respective author and/or the manufacturer.

The manufacturer tries always to observe the copyrights of others, and to draw on works created in-house or works in the public domain.

The collection of personal data (such as names, street addresses or e-mail addresses) in the manufacturer's documents is always on a voluntary basis whenever possible. Whenever feasible, it is always possible to make use of the offerings and services without providing any personal data.

We draw your attention to the fact that data transmission over the Internet (e.g. when communicating by e-mail) may involve gaps in security. It is not possible to protect such data completely against access by third parties.

We hereby expressly prohibit the use of the contact data published as part of our duty to publish an imprint for the purpose of sending us any advertising or informational materials that we have not expressly requested.

1.4.2 Disclaimer

The manufacturer will not be liable for any damage of any kind by using its product, including, but not limited to direct, indirect or incidental and consequential damages.

This disclaimer does not apply in case the manufacturer has acted on purpose or with gross negligence. In the event any applicable law does not allow such limitations on implied warranties or the exclusion of limitation of certain damages, you may, if such law applies to you, not be subject to some or all of the above disclaimer, exclusions or limitations.

Any product purchased from the manufacturer is warranted in accordance with the relevant product documentation and our Terms and Conditions of Sale.

The manufacturer reserves the right to alter the content of its documents, including this disclaimer in any way, at any time, for any reason, without prior notification, and will not be liable in any way for possible consequences of such changes.


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1.4.3 Product liability and warranty

The operator shall bear responsibility for the suitability of the device for the specific purpose. The manufacturer accepts no liability for the consequences of misuse by the operator. Improper installation or operation of the devices (systems) will cause the warranty to be void. The respective "Standard Terms and Conditions" which form the basis for the sales contract shall also apply.

1.4.4 Information concerning the documentation

To prevent any injury to the user or damage to the device it is essential that you read the information in this document and observe applicable national standards, safety requirements and accident prevention regulations.

If this document is not in your native language and if you have any problems understanding the text, we advise you to contact your local office for assistance. The manufacturer can not accept responsibility for any damage or injury caused by misunderstanding of the information in this document.

This document is provided to help you establish operating conditions, which will permit safe and efficient use of this device. Special considerations and precautions are also described in the document, which appear in the form of icons as shown below.


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1.4.5 Warnings and symbols used

Safety warnings are indicated by the following symbols.

• HANDLINGHANDLINGHANDLINGHANDLINGThis symbol designates all instructions for actions to be carried out by the operator in the specified sequence.

i RESULTRESULTRESULTRESULTThis symbol refers to all important consequences of the previous actions.

1.5 Safety instructions for the operator

DANGER!This warning refers to the immediate danger when working with electricity.

DANGER!This warning refers to the immediate danger of burns caused by heat or hot surfaces.

DANGER!This warning refers to the immediate danger when using this device in a hazardous atmosphere.

DANGER!These warnings must be observed without fail. Even partial disregard of this warning can lead to serious health problems and even death. There is also the risk of seriously damaging the device or parts of the operator's plant.

WARNING!Disregarding this safety warning, even if only in part, poses the risk of serious health problems. There is also the risk of damaging the device or parts of the operator's plant.

CAUTION!Disregarding these instructions can result in damage to the device or to parts of the operator's plant.

INFORMATION!These instructions contain important information for the handling of the device.

LEGAL NOTICE!This note contains information on statutory directives and standards.

WARNING!In general, devices from the manufacturer may only be installed, commissioned, operated and maintained by properly trained and authorized personnel. This document is provided to help you establish operating conditions, which will permit safe and efficient use of this device.

DEVICE DESCRIPTION 2

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2.1 Scope of delivery

INFORMATION!Inspect the packaging carefully for damages or signs of rough handling. Report damage to the carrier and to the local office of the manufacturer.

INFORMATION!Do a check of the packing list to make sure that you have all the elements given in the order.

INFORMATION!Look at the device nameplate to ensure that the device is delivered according to your order. Check for the correct supply voltage printed on the nameplate.

Figure 2-1: Scope of delivery

1 Measuring device in ordered version2 Product documentation3 Certificates, calibration report (supplied to order only)

2 DEVICE DESCRIPTION

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2.2 Device versions

• DK32 with valve and horizontal connection• DK34 without valve and vertical connection• DK37 with valve and horizontal connection• DK37 without valve and vertical connection

The following designs are available as options:• with inlet pressure regulator• with outlet pressure regulator• with flange adapter (total length: 250 mm / 9.8")• with indicator housing DK37 in stainless steel• with limit switches or 4...20 mA/HART signal output

Figure 2-2: Device versions

1 DK32 with valve and horizontal connection2 DK34 without valve and vertical connection3 DK37/M8E with valve and electronic indicator4 DK37/M8M with valve and mechanical indicator

Figure 2-3: Versions with regulators

1 DK32 with inlet pressure regulator2 DK32 with outlet pressure regulator


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Figure 2-4: Versions with flange adapter

1 DK34 with DN15/PN40 adapter2 DK32 with DN15/PN40 adapter

Figure 2-5: Version DK37 with stainless steel housing

1 DK37/M8E/R2 DK37/M8M/R

Figure 2-6: Versions DK32 with limit switches or 4...20 mA/HART signal output

1 DK32 with limit switches2 DK32 with 4...20 mA/HART signal output

2 DEVICE DESCRIPTION

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2.3 Nameplate

Additional markings on the measuring device:• SO - sales order / item• PA - production order• Vx - product configurator code• AC - article code


Figure 2-7: Examples of nameplates

1 Device type2 Manufacturer3 Identification number of the notified body ATEX & PED4 Rating data: temperature & pressure rating5 PED data6 Ex data7 Electrical connection data8 Matrix code9 Note to observe the documentation and for disposal


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2.4 Description code

The description code consists of the following elements*:

* positions which are not needed are omitted (no blank positions)

* positions which are not needed are omitted (no blank positions)

2.5 Electronic revision DK32/ESK, DK34/ESK

The electronic revision of the ESK3x indicates the respective hardware/software status of the electronics.

Figure 2-8: Description code DK32, DK34

1 32 - with valve and horizontal connection / 34 without valve and vertical connection2 RE - inlet pressure regulator / RA - outlet pressure regulator3 K1 - one limit switch, type NAMUR / K2 - two limit switches, type NAMUR /

R1 - one limit switch, type Reed / ESK - 4...20 mA/HART®

4 S - plug connector / L - cable entry including cable5 HT - high-temperature version6 free7 Ex - Explosion-protected equipment8 SK - SIL conformity according to IEC 61508 of the limit switch

Figure 2-9: Description code DK37

1 M8M - mechanical indicator / M8E - electronic indicator2 without - indicator housing in PPS

R - indicator housing in stainless steel3 RE - inlet pressure regulator / RA - outlet pressure regulator4 K1 - one limit switch / K2 - two limit switches5 Ex is not part of the description code6 SK - SIL conformity according to IEC 61508 of the limit switch

SE - SIL conformity according to IEC 61508 of the current output

Electronic revision Explanation

ER 1.0.x Basic version

Table 2-1: Description of the electronic revision

3 INSTALLATION

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3.1 General notes on installation

3.2 Storage

• Store the device in a dry, dust-free location.• Avoid lasting direct exposure to the sun.• Store the measuring device in the original packaging.• The permissible storage temperatures for standard devices are: -40...+80°C / -40...+176°F

3.3 Installation conditions

INFORMATION!Inspect the packaging carefully for damages or signs of rough handling. Report damage to the carrier and to the local office of the manufacturer.

INFORMATION!Do a check of the packing list to make sure that you have all the elements given in the order.

INFORMATION!Check on the device nameplates, that the device is supplied according to your order.

CAUTION!When installing the device in the piping, the following points must be observed:• The variable area flowmeter must be installed vertically (measuring principle). Flow direction

from bottom to top. For installation recommendations please refer also to directive VDI/VDE 3513, sheet 3.

• Before connecting, blow or flush out the pipes leading to the device.• Piping for gas flow need to be dried before the device is installed.• Use connectors suitable for the particular device version.• Align the piping centrically with the connection bores on the measuring device so they are

free of stresses.• If necessary, the piping has to be supported to avoid the vibrations transmitted to the

measuring device.• Do not lay signal cables directly next to cables for the power supply.• When several devices are installed next to one another, a minimum distance between the

devices is necessary (for details refer to chapter "Technical data").• The device must not be heated by radiated heat (e.g. exposure to the sun) to an electronics

housing surface temperature above the maximum permissible ambient temperature. If it is necessary to prevent damage from heat sources, a heat protection (e.g. sun shade) has to be installed.

ELECTRICAL CONNECTIONS 4

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4.1 Safety instructions

DANGER!All work on the electrical connections may only be carried out with the power disconnected. Take note of the voltage data on the nameplate!

DANGER!Observe the national regulations for electrical installations!

DANGER!For devices used in hazardous areas, additional safety notes apply; please refer to the Ex documentation.

WARNING!Observe without fail the local occupational health and safety regulations. Any work done on the electrical components of the measuring device may only be carried out by properly trained specialists.


4 ELECTRICAL CONNECTIONS

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4.2 Electrical connection of the limit switches

The electrical connection of the limit switches is made for• DK../../S - in connection plug• DK../../L - via a cable assembly

The following procedures are to be performed (DK../../S):• Loosen the screw 6 of the connector plug• Pull out the plug.• Remove the screw 6 completely from the plug.• Insert a screwdriver in the marked opening 5 (lift) and remove the terminal block.• Lead the connection cable through the cable gland.• Insert the cable (max. 1.5 mm2) and tighten it.

Figure 4-1: Electrical connection of the limit switches

5 Lift slot6 Fastening screw of connection box

Contact connection Stranded wire colour for cable assembly

1 Min minus white

2 Min plus yellow

3 Max minus green

4 Max plus brown

Table 4-1: Contact connections


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4.3 Settings of limit switches of DK32, DK34

Set the pointers to the desired limit values as a min. contact 1 or max. contact 2 along the scale.

Settings of limit switches with Reed contact:• Loosen the nut 3.• Set the reed cartridge to the desired value.• Fix the nut 3.

Figure 4-2: Connection of 3-wire reed contact

1 Silicone-insulated wire - yellow/green / FEP-insulated wire - red

2 Silicone-insulated wire - brown / FEP-insulated wire - brown

3 Silicone-insulated wire - blue / FEP-insulated wire - blue

Table 4-2: Stranded wire colour for devices with cable assembly

Figure 4-3: Settings of limit switches of DK32, DK34

INFORMATION!The reed contact is actuated directly by the float magnet. The desired switching point can only be determined in measuring mode. A reference to the scale and/or pointer cannot be established.


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4.4 Electrical signal output ESK3x for DK32, DK34

The following procedures are to be performed:• Loosen the lock screw 1 on the locking mechanism using an Allen key (WS3).• Unscrew the cover.• Connect the connecting cables to the device terminals in the terminal block 2 by ensuring the

correct polarity.• Screw on the cover.• Tighten the lock screw on the locking mechanism using an Allen key (WS3).

Figure 4-4: Electrical connection of ESK3x

1 Lock screw2 Terminal block3 Power supply 12...32 VDC4 Measuring signal 4...20 mA

5 External load, HART® communication

DANGER!For devices intended for use in hazardous areas with dust-resistant housing and/or secondary pressure containment, the special conditions for sealing the electronic compartment and for the cable entry are available in the supplementary instructions.


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4.4.1 Power supply

The required supply voltage can be calculated using the following formula:

Uext = RL * 22 mA + 12 V

withUext = minimum supply voltageRL = total measuring loop resistance

4.4.2 Load for HART communication

The maximum load resistance is calculated as follows:

RL = (Uext - 12 V) / 22 mA

4.4.3 Configuration

The ESK3x electrical signal output can be configured via HART® communication. DDs (Device Description) and DTMs (Device Type Manager) are available for the configuration.They can be downloaded free of charge from our website.The current flow rate can be transmitted using the integrated HART® communication. A flow counter can be configured. Two limit values can be monitored. The limit values are assigned either to flow values or to the counter overflow.

INFORMATION!The supply voltage has to be between 12 VDC and 32 VDC. This is based on the total resistance of the measuring loop. To calculate this, the resistance of each component in the measuring loop (not including the device) must be added up.

INFORMATION!The power supply has to be able to supply a minimum of 22 mA.

INFORMATION!For HART® communication a load of at least 230 Ω is required.

DANGER!Use a twisted two-core cable to prevent electrical interference from impeding the DC output signal.In some cases a shielded cable may be necessary. The cable shield may only be grounded (common ground connection) at one point (on the power supply unit).


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4.5 Settings of limit switches for DK37/M8M

The limit switches can be set over the entire measuring range using the maximum pointer. The set limit values are displayed on the scale. The pointers are set to the desired limit values using a slip coupling along the scale.

If the pointer vane goes into the slot, an alarm is triggered. An alarm is also triggered in the event of a cable break or short circuit if a suitable amplifier is used.

Figure 4-5: Position of the limit switch

1 Maximum pointer, switching point indicator2 Limit switches3 Connection board4 Connection terminal


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4.6 Electrical signal output for DK37/M8E

Wiring must be planned with great care when it comes to connecting other devices such as evaluation units or process control. Internal connections in these devices (e.g. GND with PE, mass loops) may lead to non-permitted voltage potentials which could negatively affect the function of the device itself or that of a device connected to it. In such cases a protected extra-low voltage (PELV) is recommended.

Figure 4-6: Electrical connection M8E

1 Terminal connection2 Power supply 14.8...30 VDC3 Measuring signal 4...20 mA


Figure 4-7: Electrical connection with galvanic isolation

1 Terminal connection2 Signal converter isolator with galvanic isolation3 Power supply (refer to isolator information)4 Measuring signal 4...20 mA



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4.6.1 Power supply

The required supply voltage can be calculated using the following formula:

Uext = RL * 22 mA + 14.8 V

withUext = minimum supply voltageRL = total measuring loop resistance

4.6.2 Load for HART communication

The maximum load resistance is calculated as follows:

RL = (Uext - 14.8 V) / 22 mA

4.6.3 Configuration

The M8E electronic indicator can be configured via HART® communication. DDs (Device Description) and DTMs (Device Type Manager) are available for the configuration.They can be downloaded free of charge from our website.The current flow rate can be transmitted using the integrated HART® communication. A flow counter can be configured. Two limit values can be monitored. The limit values are assigned either to flow values or to the counter overflow. The limit values are not depicted on the display.

INFORMATION!The supply voltage has to be between 14.8 VDC and 30 VDC. This is based on the total resistance of the measuring loop. To calculate this, the resistance of each component in the measuring loop (not including the device) must be added up.

INFORMATION!The power supply has to be able to supply a minimum of 22 mA.

INFORMATION!For HART® communication a load of at least 230 Ω is required.

DANGER!Use a twisted two-core cable to prevent electrical interference from impeding the DC output signal.In some cases a shielded cable may be necessary. The cable shield may only be grounded (common ground connection) at one point (on the power supply unit).


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4.7 Grounding connections

The measuring unit is grounded on the top fitting 1 (M4 threaded holes).Alternatively, the DK32 and DK34 with ESK3x transmitter can be grounded at the transmitter housing.

Figure 4-8: Grounding connections

1 Grounding connection at measuring unit

DANGER!The grounding wire may not transfer any interference voltage.Do not use this grounding cable to ground any other electrical devices.


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4.8 Ingress protection

The variable area flowmeters DK32 / DK34 / DK37 have been tested for IP protection in accordance with EN 60529. The following protection categories have been achieved:

Therefore it is essential to observe the following points:• Use only original gaskets. They must be clean and free of any damage. Defective gaskets must

be replaced.• The electrical cables used must be undamaged and must comply with regulations.• The cables must be laid with a loop 3 upstream of the measuring device to prevent water

from getting into the housing.• The cable feedthroughs 2 must be tightened.• Close the unused cable feedthroughs using blind plugs 1.• Do not remove the required cable bushing from the cable feedthrough.

Device variant Ingress protection according to EN 60529

DK32, DK34 mechanical IP66/IP68

DK32, DK34 with limit switches K1/K2 IP65

DK32, DK34 with transmitter ESK3x IP66/IP68

DK37 with PPS indicator IP66

DK37 with stainless steel indicator IP66/IP67

DANGER!After all servicing and maintenance work on the measuring device, the specified ingress protection category must be ensured again.

Figure 4-9: Cable feedthrough

1 Use blanking plugs if no cable is routed through2 Tighten the protection cap3 Lay the cable in a loop

START-UP 5

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5.1 Standard device

CAUTION!When starting up the device, the following points must be observed:• Compare the actual operating pressure and the product temperature of the system with the

specifications on the nameplate (PS and TS). These specifications may not be exceeded.• Make sure materials are compatible.• Slowly open the shut-off valve.• When measuring liquids ensure that the pipelines are carefully evacuated.• When measuring gases, increase pressure slowly.• Avoid float impact (e.g. caused by solenoid valves), as this is likely to damage the measuring

unit or float.

6 SERVICE

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6.1 Maintenance

Within the scope of routine maintenance of the system and pipelines, the flowmeter should also be inspected for signs of fouling, corrosion, mechanical wear and leaks, as well as damage to the measuring tube and the indicator.

We advise that inspections are carried out at least once per year.

The device must be removed from the pipeline before cleaning.

CAUTION!Pressurised pipes have to be depressurised before removing the device.In the case of devices used for measuring aggressive or hazardous media, appropriate safety precautions must be taken with regard to residual liquids in the measuring unit.New gaskets have to be used when re-installing the device in the piping.

CAUTION!The packing seal for the valve may have to be adjusted during the service life. The union nut 1 must be tightened for this. It may be necessary to push the locking pin 2 back against its internal spring.Comply with a maximum torque of 4 Nm.

CAUTION!Valves that have not been used for a longer period of time may exhibit a higher actuating torque.

SERVICE 6

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6.2 Spare parts availability

The manufacturer adheres to the basic principle that functionally adequate spare parts for each device or each important accessory part will be kept available for a period of 3 years after delivery of the last production run for the device.

This regulation only applies to spare parts which are subject to wear and tear under normal operating conditions.

6.3 Availability of services

The manufacturer offers a range of services to support the customer after expiration of the warranty. These include repair, maintenance, technical support and training.

6.4 Returning the device to the manufacturer

6.4.1 General information

This device has been carefully manufactured and tested. If installed and operated in accordance with these operating instructions, it will rarely present any problems.

INFORMATION!For more precise information, please contact your local sales office.

WARNING!Should you nevertheless need to return a device for inspection or repair, please pay strict attention to the following points:• Due to statutory regulations on environmental protection and safeguarding the health and

safety of the personnel, the manufacturer may only handle, test and repair returned devices that have been in contact with products without risk to personnel and environment.

• This means that the manufacturer can only service this device if it is accompanied by the following certificate (see next section) confirming that the device is safe to handle.

WARNING!If the device has been operated with toxic, caustic, radioactive, flammable or water-endangering products, you are kindly requested:• to check and ensure, if necessary by rinsing or neutralising, that all cavities are free from

such dangerous substances,• to enclose a certificate with the device confirming that it is safe to handle and stating the

product used.

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6.4.2 Form (for copying) to accompany a returned device

6.5 Disposal

CAUTION!To avoid any risk for our service personnel, this form has to be accessible from outside of the packaging with the returned device.

Company: Address:

Department: Name:

Tel. no.: Fax no. and/or Email address:

Manufacturer's order no. or serial no.:

The device has been operated with the following medium:

This medium is: radioactive

water-hazardous

toxic

caustic

flammable

We checked that all cavities in the device are free from such substances.

We have flushed out and neutralized all cavities in the device.

We hereby confirm that there is no risk to persons or the environment through any residual media contained in the device when it is returned.

Date: Signature:

Stamp:

LEGAL NOTICE!Disposal must be carried out in accordance with legislation applicable in your country.

Separate collection of WEEE (Waste Electrical and Electronic Equipment) in the European Union:Separate collection of WEEE (Waste Electrical and Electronic Equipment) in the European Union:Separate collection of WEEE (Waste Electrical and Electronic Equipment) in the European Union:Separate collection of WEEE (Waste Electrical and Electronic Equipment) in the European Union:

According to the directive 2012/19/EU, the monitoring and control instruments marked with the WEEE symbol and reaching their end-of-life must not be disposed of with other wastemust not be disposed of with other wastemust not be disposed of with other wastemust not be disposed of with other waste.The user must dispose of the WEEE to a designated collection point for the recycling of WEEE or send them back to our local organisation or authorised representative.

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6.6 Disassembly and recycling

This section describes how to handle and disassemble the device in order to dispose of it following end of use. The information provided enables the end user to identify and separate the main components of the device for the purpose of recycling.

6.6.1 Description of the device components

The variable area flowmeter consists of a mechanical, metallic measuring unit 1 and an indicator housing attached to it 2, which may contain electronic components.The metallic measuring unit can be sent to metal recycling after the indicator housing has been removed. Depending on the version, the measuring unit may weigh between 0.5...5 kg / 1.1...11 lb.

INFORMATION!• Wear personal protective equipment• Make sure to use a stable workstation / bench to disassemble

Figure 6-1: Description of the device components

1 Measuring unit2 Indicator housing

CAUTION!Check and ensure that the measuring units, including all cavities, are free of hazardous substances by rinsing or neutralising if required. This should be done especially in the case of devices that have been operated with toxic, corrosive, radioactive, flammable or water-contaminating products to protect both the environment and the health and safety of staff.

6 SERVICE

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DK32 - DK34 - DK37


6.6.2 Indicator versions

The following discusses the indicator housing and optional electronics in more detail.

Indicator DK37/M8x and DK37/M8x/RThe indicator housing consists of the following components:

The indicator housing can be equipped either with an electronic transmitter DK37/M8E or with one or two limit switches DK37/M8/K1 or DK37/M8/K2. They become visible after opening the cover. These can be removed from the housing in order to send them to electronics recycling/disposal.

The electronic components consist of the following main components:

Approx. information Weight / size

DK37/M8x/RStainless steel housing

DK37/M8xPlastic housing

Glass panel 45 cm² / 6.98 in² 45 cm² / 6.98 in²

PPS (housing including cover) - 300 g / 0.66 lb

Stainless steel (housing including cover)

1550 g / 3.42 lb -

Other metal parts as scale, pointer system, screws

50 g / 0.1 lb 50 g / 0.1 lb

Insert profile made of PA 40 g / 0.09 lb -

Table 6-1: Indicator DK37/M8x and DK37/M8x/R

All information is approximate DK37/…/M8E DK37/…/M8M/K.

PCB-CPU potted 67 cm² / 10.39 in² < 1 cm² / < 0.16 in²

PCB-I/O not potted 45 cm² / 6.98 in² -

PCB connection board 17 cm² / 2.64 in² 5 / 10 cm² / 0.78 / 1.55 in²

Potting (silicone) 95 g / 0.21 lb 5 g / 0.01 lb

Batteries - -

Electrolytic capacitors - -

LC display 24 cm² / 3.72 in² -

Table 6-2: Main components of the electronic components

INFORMATION!The PCBs are partially potted with silicone. It is thus not easy to separate the components by hand.

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Indicator DK32, DK34The indicator housing consists of the following components:

The indicator housing can be equipped either with an electronic transmitter DK3./ESK or with one or two limit switches DK3./K. These can be removed from the housing in order to send them to electronics recycling/disposal.

The electronic components consist of the following main components:

Approx. information Weight / size

DK3./K. DK3./ESK

Glass panel 9 cm² / 1.40 in² 9 cm² / 1.40 in²

Aluminium housing 170 g / 0.37 lb 460 g / 1.01 lb

Other metal parts as scale, pointer system, screws

50 g / 0.1 lb 50 g / 0.1 lb

Table 6-3: Indicator DK3./K. und DK3./ESK

All information is approximate DK3./ESK DK3./K.

PCB 25 cm² / 3.88 in² 1 cm² / 0.16 in²

Potting (silicone) 28 g / 0.06 lb 5 g / 0.01 lb

Batteries - -

Electrolytic capacitors - -

LC display - -

Table 6-4: Main components of the electronic components

INFORMATION!The PCBs are partially potted with silicone. It is thus not easy to separate the components by hand.

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DK32 - DK34 - DK37


7.1 Functional principle

The flowmeter operates in accordance with the float measuring principle.

The measuring unit consists of a metal cone in which a float can move freely up and down.The medium flows through the flowmeter from bottom to top.

The float adjusts itself so that the buoyancy force A acting on it, the form resistance W and its weight G are in equilibrium: G = A + W

For DK32, DK34 and DK37/M8M 1 the flow-dependent height of the float in the measuring unit is transmitted by means of a magnetic coupling on a scale.

For DK37/M8E, DK32/ESK and DK34/ESK 2 the flow-dependent height of the float in the measuring unit is transmitted to the electronic display by means of a magnetic coupling on sensors S1 and S2.

Figure 7-1: Functional principle

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DK32 - DK34 - DK37


7.2 Technical data

INFORMATION!• The following data is provided for general applications. If you require data that is more

relevant to your specific application, please contact us or your local sales office.• Additional information (certificates, special tools, software,...) and complete product

documentation can be downloaded free of charge from the website (Downloadcenter).

Measuring systemApplication range Flow measurement of liquids or gases

Function / Measuring principle Float measuring principle

Measured valuePrimary measured value Float position

Secondary measured value Operating volume flow, nominal volume flow or mass flow

Measuring accuracyDirective VDI/VDE 3513, sheet 2 (qG = 50%)

DK32, DK34 4.0%

DK37 2.5%

Operating conditionsMax. operating temperature TS Depending on the version (refer to nameplate)

Standard version: up to +150°C / +221°F

HT version: up to +200°C / +392°F

Max. operating pressure PS Depending on the version (refer to nameplate)

Standard version: 130 barg / 1885 psig 1

Max. test pressure PT Depending on the version (refer to nameplate)

Standard version: 202 barg / 2930 psig 1

Ingress protectionDK32, DK34 mechanical IP66/IP68

DK32, DK34 with limit switches K1/K2 IP65

DK32, DK34 with transmitter ESK3x IP66/IP68

DK37 with PPS indicator IP66

DK37 with stainless steel indicator IP66/IP67

Installation conditionsInlet and outlet sections None

Protect devices from vibration and high-frequency oscillation

Use in accordance with IEC 61298-3 in control room or field with medium vibration level

1 Higher pressures on request

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Materials

Other options on request:• Surface passivation of all metallic, wetted parts

• Special materials: e.g. Hastelloy®, Monel®, Inconel®, titanium a.o.

Process connection

Temperatures

1 For restrictions in hazardous areas refer to the temperature tables in the supplementary Ex instructions

Top fitting, bottom fitting, cone CrNi steel 1.4404 / 316 L

Lock screw CrNi steel 1.4404 / 316 L

Float, standard CrNi steel 1.4404 / 316 L or titanium

Dosing unit CrNi steel 1.4571 / 316 Ti

Valve stem CrNi steel 1.4404 / 316 L

Gasket of lock screw PTFE

Gasket of dosing unit FPM/PTFE, PTFE, FFKM 1

Indicator housing of DK32, DK34 Die-cast aluminium with powder coating

Indicator housing of DK37/M8_/ PPS

Indicator housing of DK37/M8_/R/ Stainless steel 1.4408/CF8M

1 Other gasket materials on request

Standard 1/4 NPT (female)

Option G1/4, Ermeto, Serto, Gyrolok, Swagelok, flanges 1

1 Other connections on request

Max. product temperature at Tamb. < +40°C / +104°F 1 [°C] [°F]

DK34, DK32, DK37 without valve -80…+150 -112...+302

DK32, DK37 with valve FPM/PTFE -25…+150 -13...+302

DK32, DK37 with valve FFKM -20…+150 -4...+302

DK32, DK37 with valve PTFE -40…+150 -40...+302

DK32 HT, DK34 HT high-temperature with FFKM -20…+200 -4...+392

DK32, DK34 with transmitter ESK3x -40...+140 -40...+284

Permissible ambient temperature 1 [°C] [°F]

DK32, DK34, DK37/M8M without electrical built-ins -40…+70 -40...+158

DK32, DK34, DK37/M8M with limit switch I7S2002-N or SJ2-SN -40…+70 -40...+158

DK32, DK34, DK37/M8M with limit switch SC2-N0 -25…+70 -13...+158

DK32, DK34 with transmitter ESK3x -40…+70 -40...+158

DK37/M8E -40…+70 -40...+158

DK32 HT, DK34 HT high-temperature -25…+200 -13...+392

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DK32 - DK34 - DK37


Indicator DK32, DK34, DK37/M8M with limit switch

DK32 - 34 /K./SDK37/M8M

Cable gland: M16 x 1.5

Terminal connection: 1.5 mm2

DK32 - 34 /K./S Clamping range: 4.5...10 mm / 0.18...0.4"

DK37/M8M Clamping range: 3...7 mm / 0.12...0.28"

DK32 - 34/K./L Ø Connecting cable: 6.3 mm / 0.25"; 0.75 mm²

Cable length: approx. 1.7 m / 5.6 ft (other lengths on request)

Limit switches SC2-N0SC2-N0SC2-N0SC2-N0I7S2002-NI7S2002-NI7S2002-NI7S2002-N

SJ2-SN (safety-oriented)SJ2-SN (safety-oriented)SJ2-SN (safety-oriented)SJ2-SN (safety-oriented)

Connection type NAMUR 2-wire 2-wire

Switching element function Normally closed Normally closed

Nominal voltage U0 8 VDC 8 VDC

Pointer vane not detected ≥ 3 mA ≥ 3 mA

Pointer vane detected ≤1 mA ≤1 mA

DK32 - DK34 with Reed contact Type: SPDT (3-wire, normally closed and normally open)

Switching reproducibility: < 5% of full scale range

Switching capacity: 12 VA 1

Max. switching capacity: 30 VDC 1

Max. switching current: 0.5 A 1

1 Reduced values for Ex

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DK32 - DK34 - DK37


Transmitter ESK3x for DK32, DK34

Cable entry M16 x 1.5 or 1/2" NPT

Clamping range of cable gland 3...7 mm / 0.12...0.28" (PA gland) or 5...10 mm / 0.2...0.39" (stainless steel gland)

Terminal connection 1.5 mm2

Measuring signal 4...20 mA = 0…100% flow value in 2-wire technology

Power supply 12...32 VDC (non-Ex)

Power supply influence < 0.1%

Dependence on load impedance < 0.1%

Temperature influence <0.3%/10 K

Max. external resistance / load 500 Ω (24 VDC), 800 Ω (32 VDC)

Min. load for HART® 250 Ω

NAMUR type test acc. to NE 95 Fulfills NE 21, NE 43, NE 107

ESK3x - electrical characteristicsProcess variable flow rate Values [%]Values [%]Values [%]Values [%] Signal output [mA]Signal output [mA]Signal output [mA]Signal output [mA]

Upper range limit +103.125 20.5

Device error identification < -2.5 or >106.25 <3.6 or > 21

Maximum 118.75 23.0

Multi-Drop operation - 4.0

Min. Uext. 12 VDC

Capacitance number (CN) 2

ESK3x HART DeviceManufacturer name (code) KROHNE Messtechnik (0x0045)

Model name ESK3x (0x45BA)

HART® protocol Revision 7.6

Device revision 1

Equipment category Transmitter

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DK32 - DK34 - DK37


Indicator DK37/M8E

Cable gland M16 x 1.5

Clamping range 3...7 mm / 0.12...0.28"

Terminal connection 2.5 mm2

Measuring signal 4...20 mA = 0…100% flow value in 2-wire technology

Power supply 14.8...30 VDC

Min. power supply for HART® 20.5 VDC

Power supply influence <0.1%

Dependence on load impedance <0.1%

Temperature influence <10 µA/K

Max. external resistance / load 640 Ω (30 VDC)

Min. load for HART® 250 Ω

Software firmware version 01.15

Identification number 3204090400

NAMUR type test acc. to NE 95 Fulfills NE 21, NE 43

M8E HART® configurationManufacturer name (code) KROHNE Messtechnik (69)

Model name M8E (230)

HART® protocol Revision 5.1

Device revision 1

Physical Layer FSK

Equipment category Transmitter

M8E process variableProcess variable flow rate Values [%]Values [%]Values [%]Values [%] Signal output [mA]Signal output [mA]Signal output [mA]Signal output [mA]

Upper range limit +102.5 (±1%) 20.24...20.56

Device error identification >106.25 ≥21.00

Maximum 112.5 22

Multi-Drop operation - 4.5

Min. Uext. 14.8 VDC

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DK32 - DK34 - DK37


Approvals for DK32, DK34

Approvals for DK37

Standard Device version Marking

ATEX Mechanical, without electrical built-ins II2G Ex h IIC T6...T3 GbII2D Ex h IIIC T150°C Db

NAMUR limit switch K1/K2 II2G Ex ia IIC T6 GbII2D Ex ia IIIC T75°C DbII3G Ex nA/ec IIC T6 Gc

Reed limit switch R1 II2G Ex ia IIC T6 Gb

4...20 mA / HART signal output ESK3x II2G Ex d IIC T6 GbII2G Ex ia IIC T6 GbII2D Ex ia IIIC T75°C DbII3G Ex nA/ec IIC T6 GcII2D Ex tb IIIC 75° Db

IECEx NAMUR limit switch K1/K2 Ex ia IIC T6 GbEx ia IIIC T75°C DbEx nA/ec IIC T6 Gc

Reed limit switch R1 Ex ia IIC T6 Gb

4...20 mA / HART signal output ESK3x Ex d IIC T6 GbEx ia IIC T6 GbEx ia IIIC T75°C DbEx nA/ec IIC T6 GcEx tb IIIC 75° Db

FM (US) NAMUR limit switch K1/K2 IS/I/1/ABCD; T6NI/I/2/ABCD; T6

Reed limit switch R1 IS/I/1/ABCD; T6

QPS (US/C)(pending)

4...20 mA / HART signal output ESK3x XP/I/1/ABCD; T6IS/I/1/ABCD; T6NI/I/2/ABCD; T6DIP/II,III/1EFG;T6

Other approvals as NEPSI, INMETRO, KCS, CCOE, EAC on request.

Standard Device version Marking

ATEX Mechanical, without electrical built-ins II2G Ex h IIC T6...T3 GbII2D Ex h IIIC T150°C Db

Electrical II2G Ex ia IIC T6 GbII2D Ex ia IIIC T75°C Db

IECEx Electrical Ex ia IIC T6 GbEx ia IIIC T75°C Db

QPS (US/C) Electrical IS/I/1/ABCD; T6

Other approvals as NEPSI, INMETRO, KCS, CCOE, EAC on request.

TECHNICAL DATA 7

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DK32 - DK34 - DK37


7.3 Dimensions and weight

7.3.1 DK32, DK34

Weight for DK32 with differential pressure regulator: 2500 g / 5.51 lb

DK32 with top/bottom valve and rear process connection

DK34 without valve and vertical process connection

1 2

Dimensions Weightapprox.

a b c d

[mm] ["] [mm] ["] [mm] ["] [mm] ["] g lb

1 DK32 42 1.66 118 4.65 90 3.55 100 3.94 700 1.54

2 DK34 42 1.66 110 4.33 - - 75 3.07 600 1.32

Version with limit switch with connector Version with limit switch with cable end

DK32 with bottom valve /DK34 without valve

DK32 with top valve DK32 with bottom valve /DK34 without valve

DK32 with top valve

3

Dimensions Weightapprox.

a b c d

[mm] ["] [mm] ["] [mm] ["] [mm] ["] g lb

3 DK32 46 1.81 approx. 90

approx. 3.55

1500 59 approx. 50

approx. 1.97

700 1.54

DK34 600 1.32

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DK32 - DK34 - DK37


Extra weight for flange adapter dependent on pressure rating of flange: approx. 1.5...9 kg / 3.3...19.8 lb

Version with flange adapter

DK32 with bottom valve DK32 with top valve DK34 without valve

4

Dimensions

a b c d

[mm] ["] [mm] ["] [mm] ["] [mm] ["]

4 DK32 - - 250 10.2 90 3.55 approx. 195

approx. 7.68

DK34 - - 250 10.2 - - - -

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DK32 - DK34 - DK37


7.3.2 DK32, DK34 with transmitter housing ESK3x

Dimensions

Total length of flange connection adapter:DK32/ESK with top or bottom valve: 250 mm / 9.8"

Weights

DK32 with ESK transmitter housing with top/bottom valve

1

a b c d

[mm] ["] [mm] ["] [mm] ["] [mm] ["]

1 DK32 100 3.94 118 4.65 90 3.55 140 5.51

approx. g approx. lb

DK32 with transmitter ESK3x 1100 2.43

DK34 with transmitter ESK3x 1000 2.21

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DK32 - DK34 - DK37


7.3.3 DK37/M8M

Dimensions

Total length of flange connection adapter:DK37/M8M with top/bottom valve: 250 mm / 9.8"

Weights

With bottom valve and rear process connection

With top valve and rear process connection

Without valve and vertical process connection

1 2

a b c d

[mm] ["] [mm] ["] [mm] ["] [mm] ["]

1 With valve 56 2.21 153 6.03 125 4.92 approx. 144

approx. 5.67

2 Without valve 56 2.21 145 5.71 145 5.71 approx. 144

approx. 5.52


DK37/M8M 800 1.76

DK37/M8M with differential pressure regulator

2600 5.73

DK37/M8M/R 2100 4.63

DK37/M8M/R with differential pressure regulator

3900 8.60

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DK32 - DK34 - DK37


7.3.4 DK37/M8E

Dimensions

Total length of flange connection adapter:DK37/M8E with bottom valve: 250 mm / 9.8"DK37/M8E with top valve: 300 mm / 11.8"

Weights

With bottom valve and rear process connection

With top valve and rear process connection

Without valve and vertical process connection

1 2 3

a b c d

[mm] ["] [mm] ["] [mm] ["] [mm] ["]

1 With bottom valve 56 2.21 153 6.03 125 4.92 approx. 144

approx. 5.67

2 With top valve 56 2.21 183 7.21 155 6.11 approx. 144

approx. 5.67

3 Without valve 56 2.21 145 5.71 145 5.71 approx. 121

approx. 4.77


DK37/M8E 1000 2.21

DK37/M8E with differential pressure regulator

2800 6.18

DK37/M8E/R 2300 5.07

DK37/M8E/R with differential pressure regulator

4100 9.04

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DK32 - DK34 - DK37


7.3.5 Minimum distances when installing several measuring devices

When installing several measuring devices side by side, a minimum distance between them has to be observed.

Figure 7-2: Minimum distances when installing several measuring devices

Device [mm] ["]

1 DK32, DK34 60 2.36

2 DK32/ESK, DK34/ESK 140 5.51

3 DK37/M8M 100 3.94

3 DK37/M8E 120 4.73

TECHNICAL DATA 7

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DK32 - DK34 - DK37


7.4 Measuring ranges

Reference condition for gas measurements:Reference condition for gas measurements:Reference condition for gas measurements:Reference condition for gas measurements:Flow measurements for gases are attributed to:- Nl/h or Nm3/h: Volume flow at standard (norm.) conditions 0°C / +32°F, 1.013 bara / 14.7 psia (DIN 1343)- SCFM or SCFH: Volume flow at standard (std.) conditions +15°C / +59°F, 1.013 bara / 14.7 psia (ISO 13443)

Measuring span: 10 : 1

Flow values: Values = 100%Water: +20°C / +68°FAir: +20°C / +68°F, 1.013 bara / 14.7 psia

Flow, water Flow, air Pressure loss

Cones Float [l/h] [GPH] [Nl/h] [SCFH] [mbar] [psi]

K 005 N3 titanium 1 - - 16 0.6 17 0.25

K 005 N1 titanium 1 - - 25 1

K 005 N1 Stainless steel - - 50 2 31 0.45

K 010 N1 titanium 1 1.5 0.4 70 2.6 31 0.45

K 010 N1 Stainless steel 3 0.8 100 4 38 0.55

K 015 N1 titanium 1 3 0.8 100 4 17 0.25


K 040 N2 titanium 1 7 1.8 250 10 17 0.25


K 080 N2 titanium 1 16 4.2 550 20 32 0.47


K 125 N2 titanium 1 25 6.6 - - 45 0.65

K 125 N2 Stainless steel 40 11 1250 50 42 0.61




K 340 N2 Triamet 150 40 4800 180 210 3.01

K 340 2 Special Stainless steel 200 53 6000 225 462 6.7

K 340 2 Special Triamet 250 66 8000 300 722 10.5

1 Titanium components are not suitable for use in oxygen applications (media with an oxygen content that is significantly higher than the oxygen content in the earth's atmosphere)!

2 DK37 only

INFORMATION!The operating pressure should be at least double the pressure loss for liquids and five times for gases. The indicated pressure losses are valid for water and air at maximum flow rate. Other flow ranges on request. Conversion of other media or operating data is performed using the calculation method in accordance with VDI/VDE directive 3513.

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DK32 - DK34 - DK37


Valves

Valve characteristics



Only DK32 and DK37 Max. flow Qv Valve characteristic value

Valve stem Water Air Kv Cv

Cones Ø [mm] Ø ["] [l/h] [GPH] [Nl/h] [SCFH] [m3/h] [GPM]

K 005 - K 010 1 0.039 5 1.32 100 3.72 0.018 0.021

K 015 - K 040 - K 080 2.5 0.98 50 13.2 1000 37.2 0.15 0.175

K 125 - K 340 4.5 0.177 160 42.3 4300 160 0.48 0.552

Spindle 1.0 mm / 0.039" Spindle 2.5 mm / 0.098"

Spindle 4.5 mm / 0.177" 1 Flow, air2 Flow, water3 Spindle revolution n

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DK32 - DK34 - DK37


7.5 Differential pressure regulators

Differential pressure regulators are used (only DK32 and DK37) to guarantee constant flow during fluctuating inlet and outlet pressure. Minimum pressures are required to operate the regulators (refer to regulator characteristics).

1 Inlet pressure regulators, type RE, NREThe regulators keep the flow rate constant in the case of a variable inlet pressure and a constant outlet pressure.

2 Outlet pressure regulator, type RA, NRAThe regulators keep the flow rate constant in the case of a constant inlet pressure and a variable outlet pressure.

There must be a pressure differential between the inlet and the outlet pressure for the outlet pressure regulators to function. The inlet pressure p1 must always be greater than the outlet pressure p2.

Regulator characteristics

INFORMATION!Differential pressure regulators are not equivalent to pressure reducing valves!

Example of inlet pressure regulatorRE-1000

Current flow rate: 1000 l/h air

Outlet pressure p2 constant:

1.013 bara / 14.7 psia

The flow rate in the device remains constant with a fluctuating inlet pressure greater than 0.5 bar / 7.25 psi.

Example for outlet pressure regulatorNRA-800

Current flow rate: 800 l/h air

Inlet pressure p1 constant: 6 bar / 87 psi

The flow rate in the device remains constant with a fluctuating outlet pressure greater than 0...5.5 bar / 0...79.8 psi.

1 Inlet pressure regulators, type RE and NRE 2 Outlet pressure regulators, type RA and NRA

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50

DK32 - DK34 - DK37


Control ranges

Inlet pressure regulator 1

Outlet pressure regulator 2

* Differential pressure between inlet and outlet pressure

Reference condition for gas measurements:Reference condition for gas measurements:Reference condition for gas measurements:Reference condition for gas measurements:Flow measurements for gases are attributed to:- Nl/h or Nm3/h: Volume flow at standard (norm.) conditions 0°C / +32°F, 1.013 bara / 14.7 psia (DIN 1343)- SCFM or SCFH: Volume flow at standard (std.) conditions +15°C / +59°F, 1.013 bara / 14.7 psia (ISO 13443)



Max. flow rate Min. inlet pressure

Water Air

[l/h] [GPH] [Nl/h] [SCFH] p1 [bar] p1 [psi]

RE-1000 ...40 ...11 ...1000 ...37 0.5 7.25

RE-4000 ...80 ...20 ...2000 ...75 1 14.5

...100 ...25 …3000 ...110 1.5 21.8

...160 ...42 ...4000 ...150 2 29

NRE-100 ...2.5 ...0.6 ...100 ...3.7 0.1 1.45

NRE-800 - - …250 ...9.0 0.1 1.45

- - …800 ...30 0.2 2.9

...25 ...6.6 - - 0.4 5.8

Max. flow rate Min. inlet pressure Min. pressure diff. *

Water Air

[l/h] [GPH] [Nl/h] [SCFH] p1 [bar] p1 [psi] Δp [bar] Δp [psi]

RA-1000 ...40 ...11 ...1000 ...37 0.5 7.25 0.4 5.8

RA-4000 ...100 ...25 …2000 ...75 1.5 21.8 1.2 17.4

- - ...3000 ...110 1.5 21.8 1.2 17.4

...160 ...42 ...4000 ...150 2 29 1.5 21.8

NRA-800 ...1 ...0.25 ...250 ...9.0 0.1 1.45 0.05 0.73

- - ...500 ...19 0.2 2.9 0.1 1.45

- - …800 ...30 0.4 5.8 0.2 2.9

...25 ...6.6 - - 0.4 5.8 0.4 5.8

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DK32 - DK34 - DK37


Technical data for differential pressure regulator

Dimensions with differential pressure regulator

Connection, standard 1/4 NPT

Connection, option Serto, Ermeto 6 or 8, hose nozzle 6 mm or 8 mm, Dilo, Gyrolok, Swagelok, G1/4

Max. operating gauge pressure (at +20°C / +68°F) 64 barg / 928 psig

Product temperature +150°C / +302°F

Material CrNi steel 1.4404

Gasket PTFE

Diaphragm Carbon/graphite-filled PTFE

O-ring FPM or FFKM

Higher pressures and temperatures, other connections or materials on request

approx. a approx. b c d

[mm] ["] [mm] ["] [mm] ["] [mm] ["]

DK32 230 9.1 163 6.4 70 2.8 23 0.91

DK37 230 9.1 200 7.9 70 2.8 23 0.91

DK37/M8E 1 230 9.1 230 9.1 70 2.8 23 0.91

1 with outlet pressure regulator

DK32 with inlet pressure regulator DK37/M8M and M8E with inlet pressure regulator

DK32 with outlet pressure regulator DK37/M8E with outlet pressure regulator

KROHNE – Process instrumentation and measurement solutions

• Flow

• Level

• Temperature

• Pressure

• Process Analysis

• Services

Head Office KROHNE Messtechnik GmbHLudwig-Krohne-Str. 547058 Duisburg (Germany)Tel.: +49 203 301 0Fax: +49 203 301 [email protected]

© K

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The current list of all KROHNE contacts and addresses can be found at:www.krohne.com

dk32 - dk34 - dk37 hahandbndbooookk · 2019. 5. 6. · example: ped/g1/4.3/sep g gases and steam 1...

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